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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright 2021, Blender Foundation.
*/
/** \file
* \ingroup draw_engine
*/
#pragma once
#include "BKE_image.h"
#include "BKE_image_partial_update.hh"
struct PartialImageUpdater {
struct PartialUpdateUser *user;
const struct Image *image;
/**
* \brief Ensure that there is a partial update user for the given image.
*/
void ensure_image(const Image *image)
{
if (!is_valid(image)) {
free();
create(image);
}
}
virtual ~PartialImageUpdater()
{
free();
}
private:
/**
* \brief check if the partial update user can still be used for the given image.
*
* When switching to a different image the partial update user should be recreated.
*/
bool is_valid(const Image *new_image) const
{
if (image != new_image) {
return false;
}
return user != nullptr;
}
void create(const Image *image)
{
BLI_assert(user == nullptr);
user = BKE_image_partial_update_create(image);
image = image;
}
void free()
{
if (user != nullptr) {
BKE_image_partial_update_free(user);
user = nullptr;
image = nullptr;
}
}
};
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